A CMOS Relaxation Oscillator with Process and Temperature Variation Compensation
| Autor: | Zhenyan Huang, Kewei Hu, Yi Ding, Nick Nianxiong Tan, Hanming Wu, Xiao-Peng Yu |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Circuits, Systems and Computers. |
| ISSN: | 1793-6454 0218-1266 |
| Popis: | In this paper, a CMOS relaxation oscillator with trimming and temperature compensation is presented for the on-chip multi-sensor systems which need MHz level frequency source. The proposed scheme uses a single current branch to charge the capacitor to generate the oscillation with voltage average feedback (VAF) circuit. Binary-weight current trimming array is adopted to reduce the frequency variation caused by the process variation under different process corners. A compensation calibration resistor array with Kelvin connection is utilized to improve the frequency variation with temperature. With the help of VAF, the frequency spread caused by the comparator delay is suppressed. This relaxation oscillator with a typical frequency of 13.4[Formula: see text]MHz is implemented in a standard 180[Formula: see text]nm CMOS process. Simulation results show that it achieves a frequency temperature coefficient of 28.3[Formula: see text]ppm/∘C from [Formula: see text]C to 125∘C and a 0.074%/0.1[Formula: see text]V frequency variation when supply voltage changes from 2.9 to 3.7[Formula: see text]V. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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